Order of passing optimization flags to gcc

[Jonathan Wakely]

On 14 October 2015 at 05:50, Mohamed Boussaa wrote:
> I would like to define a set of 10 optimization options to an input C program.
> example: gcc -fauto-inc-dec -fbranch-count-reg
> -fcombine-stack-adjustments ... test.c -o out.o
> Does the order of these options affect the effectiveness of the produced code?

No.

The only time the order of options makes a difference is for options
that cancel or override each other, in which case the last such
options wins.

For example, given -ffoo -fno-foo the order matters, and given
-march=i586 -march=i686 the order matters.